The 5 X 5 Approach
 

Legends like Reg Park (Arnold Schwarzenegger’s idol growing up) have sworn by 5x5. If I’m training, say, chest with 3-4 exercises, I typically won’t do all 3-4 exercises with five sets of five; more like the first exercise or two, then revert back to 8-12s for the last two.

After all, changing things up doesn’t mean you have to completely overhaul every single exercise and set in your routine – just tweaking an exercise or two can do the trick.